Lac Holy Bay is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec.

• Latitude: 48° 51' 28'' North   (decimal: 48.8577778)
• Longitude: 74° 8' 2'' West   (decimal: -74.1338889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• GPS Coordinate Locator Map: Lac Holy Bay Lat/Long